/r/OutOfTheLoop - Have you ever seen a whole bunch of news stories/reddit posts/videos or anything else about some topic and you had no idea what everyone was going on about? Here is where can ask what it is all about!

/r/Serendipity - a meta-subreddit meant to broaden the perspective of its subscribers. It takes a popular entry from a random subreddit and posts it every few hours.
If you want to increase your exposure to niche subreddits, or just your perspective on things on the web in general, serendipity might help you do that. But it might not. It's a bot, after all.

/r/TellReddit - Feel like telling everyone something but don't want to do an AMA? Then this is the subreddit for you!

So I just saw something very revealing posted on Reddit that matched almost exactly someone I know. Down to the hair style, with changes in hair through time, timing of the event, down to the boyfriends name, it was uncanny, then I found a picture of her (reddit stalking) and it was not her. I was thrilled at the thought.

tl;dr thought I found someone I knew naked on reddit (was not gonewild)